Because my friends girlfriend took a course of it in college and it amounted to her screaming "No!!!" and hammer fisting to the groin. Two things you don't need a course to teach and would still end up getting you killed anyways.

The street argument is retarded. BJJ is so much overkill for the street that its ridiculous. Unless you're the idiot that picks a fight with the high school wrestling team, barring knife or gun play, the opponent shouldn't make it past double leg + ground and pound - Osiris